code: def test_merged_inputs(self):
      network = layers.join(
          layers.Input((10, 2)),
          layers.Input((None, 2)),
      )
      self.assertShapesEqual(network.input_shape, (None, 10, 2))
      self.assertShapesEqual(network.output_shape, (None, 10, 2))
  
file_path: neupy/tests/layers/test_input.py
imports: from neupy import layers
  from neupy.exceptions import LayerConnectionError
  from base import BaseTestCase
label_desc: Use image node_id 3 for calling the InputTestCase obj's underlying member method code with example usage: obj.test_merged_inputs() without return types